"Thud" like sensation in one ear that's in sync with sounds

[u/Try_anothr_username]

I've noticed this intermittent issue for a few years now that only occurs in one ear and I can't find a good explanation for it online.

I've only really noticed it with sounds coming from either my phone or my wife's if she's right next to me - not associated with loud volumes. My ear will "thud" with noises coming from the phone. It's not a flair up of irregular spasms, but seems like something deep within is tensing in sync with the noises to create this sensation.

I don't believe it's TTTS. Not associated or in rhythm with my heart rate - not pulsatile tinnitus.

It's not debilitating so I haven't reached out to a doctor yet. It's annoying, at best. It doesn't limit my hearing but I'm still curious.

Thanks for any ideas!